In the Pilot service at Liverpool we had many nicknames, of which possibly the most unusual applied to the name Green.
Our senior Green was "Bodger"
Next was "Flook"
Next was "Rufus". None were related, but the names came from a cartoon-strip in the Daily Mail. It was well understood that the next Green would be "Trog".
Two brothers named Moore were respectively "Pony" (who was very large) and his younger brother (not large at all) who was "Puny".
Also twin brothers (who shall remain nameless) known as "Poke" and "Smoke" or "Minge" and "Binge" (respectively) - or even Snitchy and Snatchy - but these were never really identified.
In a history of the Service (published in 1949) recorded nicknames since 1766 were, Old Slash, Hurricane Dick, Rocks Ahead, Bowger, Footie, The Black Bishop, Swanny, White Wings, Digger, Gentleman Joe, Wassie, nuttie, The Count, Dan Leno, Nobby, Pop, Tich, Barney, Hans, Spike, Morny, Tod, Tubby, Ike, Curly, Wuffy and Soss.
One reason for so many nicknames was probably the high percentage of Welsh surnames (Williams, Jones, Parry, Evans etc) which called for some convenient differentiation.